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Poolman,

Dipstick housing represents crankcase prssure, so it is almost always high from blow-by combustion. The dipstick can never suck in.

Vacuum exist in the Intake Manifold only.
Wrong... Pull your dipstick with the engine running. There is vacuum. Pressure would cause the dipstick to shoot out.

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Blowby combustion in the crankcase = positive pressure

Vacuum is negative pressure, which you claim is only present in the intake manifold. Which is incorrect. Its present in the entire crankcase.

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